TruGuard, 2 Pack, 1-5/8", Black, Dual Wheel Caster With U-Bracket, 55 LB Load Capacity, Good For Use On Carpeted Surfaces, Dual Wheels Place More Wheel Surface On Carpet, Wheels Move Independently In Opposite Directions To Maximize Maneuverability , For Use On Ready To Assemble Furniture, Office Chairs, Printer Stands & Entertainment Centers, Attaches With Small Screws, Included In Package.